Assuming that you did a default installation, you can click Start-->Programs-->National Instruments-->FieldPoint 3.0-->FieldPoint Help. There is a category called Errors and Warning Codes. Under that category is two subcategories; FieldPoint Specific Error Codes and General Error codes. These two sub-categories should list most error codes that you will see.
Regards,
Aaron
LabVIEW Champion, CLA, CPI